ESXi 5.5 Virtual Networking

I have a situation where my existing ESXi 4.1.3 infrastructure virtual network is on a subnet 10.1.2.0/24.This environment contains 3 HA pair clusters and many virtual machines. The IP address has been exhausted.

We have now acquired a new 3 x ESXi 5.5 host and have allocated to run in the subnet 10.1.4.0/24, which is to be used to power our VM View Horizon 5.2 infrastructure.

I have installed a new vcenter server 5.5 on the subnet 10.1.2.0/24, to be moved to the 10.1.4.0/24 once I can figure out how to integrate the existing and the new virtual network so that VMs and ESXi hosts from the two environment can talk to one another.

All ESXi hosts from the two ESXi environment have 4 x NICs, and presently we have the existing ESXi configured with 2 x vNIC teamed including the management and VM newtwork powered by the teamed vNIC.

Can someone help me with the best design to integrate the two (existing and new) infrastructure ?

All I want is that I want ESXi 4.1.3 on 10.1.2.0/24 to integrate and be able to talk to ESXi 5.5 on 10.1.4.0/24. Both subnet/vLANs have been setup with their own DHCP scopes.

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